Disc discrimination apparatus and method

Inactive Publication Date: 2011-09-01
JVC KENWOOD CORP A CORP OF JAPAN
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  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0021]This invention offers the following advantage. I

Problems solved by technology

Accordingly, it tends to take a long time t

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  • Disc discrimination apparatus and method
  • Disc discrimination apparatus and method
  • Disc discrimination apparatus and method

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Embodiment Construction

[0030]FIG. 1 shows an apparatus 10 for reproducing recorded information from an optical disc according to a first embodiment of this invention. The apparatus 10 may include an optical-disc player such as a CD (Compact Disc) player. The optical-disc player 10 may be provided in an automotive vehicle. The optical-disc player 10 is divided into an optical-disc drive and other portions.

[0031]The optical-disc player 10 can drive or play an optical disc 11 such as a CD being one of a CD-DA, a CD-R, and a CD-RW. The CD-R is a standard-quality CD-R or a low-quality CD-R. The low-quality CD-R has a quality lower than a standard quality. A first example of the low-quality CD-R has a track pitch narrower than a standard value. A second example of the low-quality CD-R has optical characteristics causing a small tracking error amplitude or a great crosstalk.

[0032]When being chucked in the optical-disc player 10, the optical disc 11 is on a turntable (not shown) and is pressed thereto from above ...

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Abstract

Detection is made as to at least one of a ratio between a tracking error and a focus error, and a duty cycle of an off-track signal with respect to an optical disc. A decision is made as to whether or not the optical disc is playable on the basis of the detected at least one of the ratio and the duty cycle. The ratio is a ratio of the focus error to the tracking error or a ratio of the tracking error to the focus error.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]This invention relates to a disc discrimination apparatus which may be provided in a recording-disc player such as an on-board CD (Compact Disc) player. In addition, this invention relates to a disc discrimination method.[0003]2. Description of the Related Art[0004]A conventional apparatus for reproducing recorded information from a recording disc such as a CD operates as follows. When a recording disc is inserted into an apparatus body, the conventional apparatus decides whether or not the inserted disc can be played by the apparatus, that is, whether or not recorded information can be reproduced from the inserted disc by the apparatus. In the case where the apparatus decides that the inserted disc can be played, the apparatus starts a process of reproducing recorded information from the disc. Otherwise, the apparatus does not start the process.[0005]Japanese patent application publication number 2006-228401 discloses ...

Claims

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Application Information

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IPC IPC(8): G11B20/18G11B7/00
CPCG11B19/12G11B20/10009G11B2220/2545G11B20/10388G11B20/10462G11B20/10027
Inventor KOMATSU, TAKAHIROFUJII, SEIICHIROUBUKATA, MASAO
Owner JVC KENWOOD CORP A CORP OF JAPAN
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